Social media accounts tied to the 16-year-old who shot two classmates at Evergreen High School were littered with references to white supremacy, antisemitism and other mass shootings — signs the teen had been radicalized online before his attack, experts say.

But some of the references were enigmatic enough that they might appear innocuous to people unfamiliar with their meaning, which is why those experts say parents and teachers need to become aware of a new subculture that is developing online and exposing children and teens to violent extremism.

“We feel like people don’t even know that this is going on,” said Oren Segal, the Anti-Defamation League’s senior vice president of counter-extremism and intelligence. “I need parents and educators to know this as much as law enforcement

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